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The new electro-mechanical shutter. Part 11

The new electro-mechanical shutter. Part 11

Now it is time for the permanent shutter. To attach the Compur-shutter, we are going to disassemble a 12 mm Kenko adapter ring. We are only going to use the 2 flanges. From the disassembly process, we hang on to the 3 small screws from the left flange and the 4 screws from the right flange. We are going to use these screws to fasten the old flanges to our new adapter rings . We will need 2 additional mounting rings to connect the Nikon fittings with the Compur shutter

The design of the mounting rings is a very exacting piece of work. There is no alternative to manufacturing these rings. We will use a 60 mm piece of square aluminum stock for these. We will use the 4 corners to connect both new rings to the Compur shutter. The connection has to be strong enough to handle the weight of the lens. A flat aluminum plate is also needed to attach the electromagnet that the shutter must pull open

For turning the new pieces on the lathe, we called on a model builder for help. These folks are experienced at turning extremely small parts and have the equipment that is needed. Turning these rings demands a lot of work. Special bits must be made to finish the piece as well as an attachment to secure the square block in a triangular support. This takes all kinds of time to accomplish, but finally both rings are ready for assembly. Here is a photo taken during the turning of the rings

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